Stringer assemblies and methods of forming thereof

A method of forming a stringer assembly, the method comprising:

• joining a first end of an intermediate tape composite stiffener to a composite base, the first end comprising flared-out edges;
• and
• joining a first fabric composite stiffener and a second fabric composite stiffener to the composite base and to the intermediate tape composite stiffener,
• wherein each of the first fabric composite stiffener and the second fabric composite stiffener comprises a web portion, a flange portion, and a curved portion, the curved portion disposed between the web portion and the flange portion and conforming to a corresponding one of the flared-out edges of the intermediate tape composite stiffener, wherein each web portion comprises a tapered-out edge that increases in thickness, and wherein the intermediate tape composite stiffener extends from the curved portions to the taper-out edges of the first and second fabric composite stiffeners.

A method for forming a stringer assembly, the method comprising:

• forming a first fabric composite stiffener and a second fabric composite stiffener;
• joining a first end of an intermediate tape composite stiffener to a composite base, the first end comprising flared-out edges;
• and
• bending the first fabric composite stiffener and the second fabric composite stiffener to conform to the composite base and to the intermediate tape composite stiffener,
• wherein each of the first fabric composite stiffener and the second fabric composite stiffener comprises a web portion, a flange portion, and a curved portion, disposed between the web portion and the flange portion, wherein the web portion comprises a tapered-out edge that increases in thickness;
• and
• wherein, after bending, the curved portion of each of the first fabric composite stiffener and the second fabric composite stiffener conforms to a corresponding one of the flared-out edges of the intermediate tape composite stiffener,
• wherein the intermediate tape composite stiffener extends from the curved portions to the taper-out edges of the first and second fabric composite stiffeners.

A method for forming a stringer assembly, the method comprising:

• joining a first end of an intermediate tape composite stiffener to a composite base, the first end comprising flared-out edges that increase in thickness;
• and
• joining a first fabric composite stiffener and a second fabric composite stiffener to the composite base and to the intermediate tape composite stiffener,
• wherein each of the first fabric composite stiffener and the second fabric composite stiffener comprises a web portion, a flange portion, and a curved portion, the curved portion disposed between the web portion and the flange portion and conforming to a corresponding one of the flared-out edges of the intermediate tape composite stiffener,
• wherein the web portion comprises a tapered-out edge that increases in thickness and a second end of the intermediate tape composite stiffener, opposite of the first end, is positioned between the tapered-out edge of the first fabric composite stiffener and the tapered-out edge of the second fabric composite stiffener.